RIA452 Commissioning
Endress+Hauser 25
Pump monitoring function
The digital inputs 1 to 4 are permanently assigned to relays 1 to 4 for the pump monitoring
function. This function is activated for the relevant digital input using the Function
parameter. Pump must be selected here.
Generally, two different types of monitoring are possible.
The setting for Sampl. time determines the operating mode chosen.
• Fault monitoring: Sampl. time = 0
In the case of fault monitoring, the level at the digital input is changed by a fault on the
pump.
• Startup monitoring: Sampl. time <> 0
In the case of startup monitoring, feedback on the correct startup of the pump is sent to
the panel meter via a level change at the digital input.
a) Fault monitoring operating mode
The status signal indicates availability of the pump in the fault monitoring operating mode.
If a fault occurs, the status signal changes accordingly.
G09-RIA452ZZ-16-10-xx-en-006
Fig. 13: Fault monitoring operating mode
In event 1, pump 1 is requested due to limit value violation of the level. Pump 1 remains
active until the level drops as much as required.
In event 2, a fault occurs at pump 1 during operation, status signal at DI1 changes. Pump 2
and the alarm relay are activated subsequently (if configured accordingly) and the pump
fault is shown as a message on the display.
In event 3, the level has fallen so much that pumping is no longer necessary and pump 2
stops operation.
The fault at pump 1 was rectified, the status signal at DI1 changes once more. The alarm
relay is reset, see event 4.
In event 5, the alarm relay and error message are acknowledged on the display by pressing
the jog/shuttle.
Events 6 and 7 show uninterrupted operation of the system.
b) Startup monitoring
In the case of the startup monitoring operating mode, a change of the status signal is
expected at the relevant digital input after a pump is activated. A waiting time is defined for
this (Sampl. time, T). Alternating pump control is activated. If the signal does not change
within the defined time, the pump is taken to be faulty.
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